Calendar

Drag a event and drop into callendar.

Go to shop and buy some products.
Check the new CI from Corporation.
Send documents to John.
Phone to Sandra.
Chat with Michael.

FullCalendar

is a jQuery plugin that provides a full-sized, drag & drop calendar like the one below. It uses AJAX to fetch events on-the-fly for each month and is easily configured to use your own feed format (an extension is provided for Google Calendar).

FullCalendar documentation